Garbo for one married in South East (5)
I believe the answer is:
swede
'garbo' is the definition.
(Greta Garbo was Swedish)
'one married in south east' is the wordplay.
'one married' becomes 'wed' (wed can mean married).
'in' indicates putting letters inside.
'south east' becomes 'SE' (abbreviation).
'wed' going inside 'se' is 'SWEDE'.
'for' is the link.
(Other definitions for swede that I've seen before include "plant" , "Weeds out to get turnip" , "Person like Strindberg" , "Citizen of kingdom" , "Large root vegetable" .)